ATM thieves had drilled a small hole, wide of about 4 centimeters (1.5 inches), on the side of the ATM's PIN (numbers) pad. After dismantling a similar ATM in their laboratory, Kasperksy researchers realized this hole was right near a crucial ATM component, a 10-pin header.

This 10-pin header wasn't just any connector, but the header for connecting straight to the ATM's main bus, which interconnected all the other ATM's components, from the screen to the PIN pad, and from the internal cash store to the ATM dispenser.